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氩气除气对AZ91镁合金热压缩性能的影响
Effects of Ar Degassing on Thermal Compression Performance of AZ91 Alloy
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- DOI:
- 作者:
- 贾征 宋婷婷 付丽 杜安娜 王彤 马煜林
JIA Zheng;SONG Tingting;FU Li;DU Anna;WANG Tong;MA Yulin
- 作者单位:
- 沈阳大学机械工程学院 东北大学材料电磁过程研究教育部重点实验室
College of Mechanical Engineering,Shenyang University,Shenyang 110044,China;Key Laboratory of Electromagnetic Processing of Materials,Ministry of Education,Northeastern University,Shenyang 110819,China
- 关键词:
- 氩气除气 氢含量 热压缩 流变应力 本构方程
Ar degassing hydrogen content thermal compression flow stress constitutive equations
- 摘要:
- 研究了氩气除气对AZ91镁合金含氢量的影响,并在250~400℃,应变速率为0.01~10.00 s^-1条件下进行热压缩实验,对比研究热压缩性能。结果表明,除气后铸锭中含氢量可从未处理前的14.8 cm^3/100 g降至7.3 cm^3/100 g,除气率高达50.7%;热压缩时,流变应力随温度的升高而降低,随应变速率的增加而升高;应变速率较大时,除气后铸锭的流变应力略高于未除气铸锭的流变应力,并计算获得了不同条件下的热变形本构方程。
The effect of argon degassing on the hydrogen content of AZ91 magnesium alloy was studied,and the thermal compression experiment was carried out under the condition of 250~400℃and the strain rate was 0.01~10.00 s^-1.The results show that after Ar degassing,the hydrogen content in the ingot can be reduced from 14.8 cm^3 per 100g before treatment to 7.3 cm^3 per 100g,and the degassing rate is up to 50.7%.During thermal compression,the rheological stress decreases with the increase of temperature and increases with the increase of strain rate.When the strain rate is large,the rheological stress of degassing ingot is slightly higher than that of undegassing ingot.The constitutive equations of thermal deformation under different conditions are obtained.